Refactor: start using scheduler mixin (#33)

Feat: adjust fields for ECS compatibility (#28)

Previously plugin was setting the top level command and host fields for every event (which aren't ECS compliant).

Also changes behavior not to override fields if they exists in the decoded payload (e.g. no longer force the host field if such a field is decoded from the command's output).

Co-authored-by: Ry Biesemeyer <yaauie@users.noreply.github.com>
Co-authored-by: Karen Metts <35154725+karenzone@users.noreply.github.com>

improve doc about fork memory usage (#27)

* doc about fork memory usage

* Update docs/index.asciidoc

* bump version to v3.3.3

Version bump to 3.3.2

And changelog update

Fixes #21

set default_codec doc attribute

update changelog for 3.3.0

add 'schedule' option to allow cron scheduling (#14)

[skip ci] update gemspec summary

Version bump

For elastic/logstash#7993

[ci skip]

bump patch level for doc generation